A shell-type internal broach assembly including a number of annular insert mounting shells interleaved with a number of annular spacers, and mounted on an arbor. The annular insert mounting shells are sufficiently short so as to permit the use of travelling-wire EDM manufacturing methods. As a result,...http://www.google.es/patents/US5352068?utm_source=gb-gplus-sharePatente US5352068 - Broach apparatus
